The project is designed to develop a density- based parking allotment system. This system indicates no entry to a vehicle to park when the parking area is fully occupied. Parking congestion is a severe problem in many major cities across the world and it has become a nightmare for the commuters in these cities.

The proposed system uses a microcontroller of the 8051 family duly interfaced with sensors to detect the parked vehicle with Red, orange and green LEDs for display purpose. The sensors used in this project are IR and photodiodes pair which are in line of sight position across a parking lot entry point to detect vehicle density at any particular time. The density of the vehicle is measured in three zones based on which vehicles are allotted with indications for parking.

The power supply consists of a step-down transformer 230/12V, which steps down the voltage to 12V AC. This is converted to DC using a Bridge rectifier. The ripples are removed using a capacitive filter, and it is then regulated to +5V using a voltage regulator 7805, which is required for the operation of different ICs and components.

Furthermore, the project can be enhanced by adding a motor to stop and allow the vehicle as barricade.